Molds thrive in soil, on plant life and on decaying organic matter. In nature, this helps in the process of natural decay and rebirth. Molds come in a variety of colors, from ghostly white to black, gray, green and blue. There are even references to mold in ancient Greek, Roman and Hebrew literature, including: “If the defiling mold reappears in the house after the stones have been torn out and the house scraped and plastered, the priest is to go and examine it and, if the mold has spread in the house, it is a persistent defiling mold; the house is unclean. It must be torn down – its stones, timbers and all the plaster – and taken out of the town to an unclean place.” Leviticus 14:43-45 (New International Version).